I think, physics is concerned with the (temporary) state of things. That includes searching for the basic laws of nature and their interacrion. Chemistry is concerned with how things change (on a bigger scale, of course).

Can anyone here give me the best definition of the meaning of physics?? Thanks

Physics is the mathematical study of all conceivable universes. A universe is a mathematical model that describes spacetime, matter, energy and their interactions. Think of each model universe as filling one page in the atlas of all possible universes.

“Philosophy is written in this grand book, the universe, ... But the book cannot be understood unless one first learns to comprehend the language and read the characters in which it is written. It is written in the language of mathematics.” - Galileo Galilei.

that's a bit too broad of a definition. that's...more of a definition of science in general. :tongue:

another vote for the study of matter, energy, and spacetime.

Actually, the broad definition of what science is has more in common with the definition of what physics is, than it does with chemistry and biology. For example, if we go by the question of "What is Science" as addressed by the APS statement below:

1. (used with a sing. verb) The science of matter and energy and of interactions between the two, grouped in traditional fields such as acoustics, optics, mechanics, thermodynamics, and electromagnetism, as well as in modern extensions including atomic and nuclear physics, cryogenics, solid-state physics, particle physics, and plasma physics.
2. (used with a pl. verb) Physical properties, interactions, processes, or laws: the physics of supersonic flight.
3. (used with a sing. verb) Archaic. The study of the natural or material world and phenomena; natural philosophy.

Seems like the point is that Physics is the study of the interactions.